What value does the 'isEmpty' operation on a queue return if the queue contains no elements?
0
The first element in the queue
-1
True
Which of the following real-world scenarios can be effectively modeled using a queue?
Handling customer service requests in a first-come, first-served manner.
Managing a priority-based task list.
Implementing an undo/redo functionality in a text editor.
Storing the browsing history in a web browser.
What is the role of the 'front' pointer in a queue data structure?
It determines if the queue is full or not.
It points to the location where the next element will be added.
It keeps track of the total number of elements in the queue.
It points to the element that has been in the queue the longest.
How does an array-based queue handle the underflow condition?
By using a circular array to reuse the empty spaces.
By dynamically resizing the array.
By raising an exception or returning an error value when attempting to dequeue from an empty queue.
By overwriting the existing elements.
What data structure is used to implement a priority queue?
Array
Stack
Linked List
Heap
What is a potential drawback of implementing a queue using an array with a fixed size?
Requirement of complex algorithms for insertion and deletion.
Increased time complexity for enqueue and dequeue operations.
Inability to store elements of different data types.
Risk of queue overflow if the queue reaches its maximum capacity.
What happens to the elements in an array-based queue after a dequeue operation?
The remaining elements are shifted one position towards the front of the array.
The 'front' pointer is adjusted to point to the next element in the queue, effectively removing the first element logically.
The dequeued element is marked as deleted but remains in the array.
The array is resized to accommodate the removal of the element.
Which of the following operations on a queue does NOT have a time complexity of O(1) in a standard implementation?
isEmpty
Dequeue
Searching for a specific element
Enqueue
When would it be more advantageous to use a linked list implementation of a queue over an array-based implementation?
When dynamic resizing and the potential for overflow are concerns.
When the maximum number of elements in the queue is known in advance.
When memory usage needs to be tightly controlled.
When dealing with a small, fixed number of elements.
What is the purpose of the 'front' pointer in an array implementation of a queue?
It tracks the total number of elements in the queue.
It points to the most recently added element.
It points to the next available empty location.